I really don’t know _______ I put my wallet

Chinese vessels ________ 646,000 square kilometers in the southern Indian Ocean in search of the missing Malaysian flight MH370.

When we were young, every evening my brother and I ______ stay at home waiting for our mother.

We’ll have a________ holiday. Let’s go to the beach，shall we

The little chick the ________ earthworm，deciding whether to swallow itor let it go.